MAXXflo EVO Technical Specification Guide

1

MAXXflo EVO Technical Specification Guide

Andrews. Built to perform.

MAXXflo EVO TECHNICAL SPECIFICATION GUIDE

CONTENTS

Welcome to Andrews Water Heaters 03Introducing the MAXXflo EVO 04Water heater construction 05Technical information 06 MAXXflo EVO suggested engineer specification 07 Dimensions and connections 08Wiring information 09Typical flue installation 10 Complete unvented systems kit and accessories 11Technical support and declaration of compliance 12Size-it information 13Range overview 14

For further information on the MAXXflo EVO and other Andrews Water Heaters products, contact your Area Sales Manager today. Details can be found at andrewswaterheaters.co.uk

3

WELCOME TO ANDREWS WATER HEATERS

Andrews Water Heaters is the market leading manufacturer of commercial gas fired water heaters.

Established in 1976, Andrews has a comprehensive range, meaning we have the solution for any commercial and industrial application, however large or small.

Our water heaters are energy efficient and fully compliant with water byelaws, Part L of the Building Regulations, and the Low Carbon Buildings Programme.

With a specialist team, and a reputation for quality, reliability and high performance products, Andrews can provide hot water delivery to meet the requirements of the most demanding applications.


Introducing the MAXXflo EVO

We’ve re-engineered MAXXflo to create MAXXflo EVO.Specifically designed to meet industry demands – it deliverslow, future-proofed NOX emissions that meet the London Plan. With efficiency of up to 98%, new BMS connectivity offering 24/7 remote monitoring and a continuous supply of hot water with a 1920lt/hr recovery rate it delivers class-leading performance.

Models available in 30, 60, 90 and 120kW outputs with 200 or 300 litre storage capacity.

Features Benefit

30 and 60kW single burners and twin burners between 90 and 120kW

With fewer burners both commissioning and planned maintenance costs are minimised

Independent service valves and pressure sensors on each heat exchanger in twin burner versions

Full built in redundancy and service flexibility as burners and heat exchangers can be isolated for servicing

Low NOX burners Compliant with and exceeds current legislative requirements

High efficiency modulating pumps (ErP rated A) Improved operating efficiencies with greater temperature control

Multi-line graphical display Access to live data, settings and history. Easy to use with full control of the burners and accurate charging of integral tank

Ready to connect into BMS via Modbus protocol Easy integration into Building Management System for remote monitoring and control; identifies specific problems and maximises maintenance efficiency

Full anti-legionella functions with strap-on sensor as standard Control of secondary return circuit temperature and pump operation ensures protection against legionella and improves safety

OUTPUT

30 -120kW

GROSS EFFICIENCY

98%

RECOVERY RATE NOx EMISSIONS (0%O2)

Up to 1,920 l/hr

at 50°C rise

As low as 36mg/kWh

5

Water heater construction

1 Return Sensor Kit

2 Air vent 1/2”

3 28x28x1/2” Compression Tee

4 Access Hatch Assy inc. o-ring

5 Temp Sensor DHW Tank B3

6 Tank

7 28mm Obtuse Compression Elbow

8 Option - Castor Assembly

9 Condensate Trap

10 Temperature/Pressure Relief Valve 10bar/95ºC

11 3/4” Gas Cock c/w test nipple

12 3/4” Gas Union M&F

1

10

11

12

2 3 4

5

6

7

8

9


Technical Information

SINGLE BURNER TWIN BURNERCWH

30/201CWH

30/301CWH

60/201CWH

60/301CWH

90/302CWH

120/302Product code 7726948 7726950 7726949 7726951 7726952 7726953Performance Maximum heat input net (gross) kW 28(31) 28(31) 56(62) 56(62) 84 (93) 112 (124)

Heat output kW 30.5 30.5 61 61 91.6 122Gross thermal efficiency % 98 98 98 98 98% 98%Standby loss kWh/day 1.68 2.26 1.68 2.26 2.26 2.26

ErP NOX emissions (0% O2) mg/kWh 39 39 36 36 39 36ErP efficiency rating A A A A - -Water heater efficiency % 95 98 91 97 91 90Noise level (EN15036-1 avg @1m) dBA 53 63 53 63 62 65

Gas data Gas flow rate (natural gas) m3/hr 2.95 2.95 5.95 5.95 8.7 11.6

Gas flow rate (propane) m3/hr 1.15 1.15 2.35 2.35 3.5 4.7Water Storage capacity litre 200 300 200 300 300 300

Recovery rate through 50°C Δt litre/hr 480 480 960 960 1440 1920Recovery rate through 56°C Δt litre/hr 429 429 856 856 1286 1712Maximum operating pressure (unvented) bar 6 6 6 6 6 6Minimum working pressure bar 0.8 0.8 0.8 0.8 0.8 0.8Maximum static pressure bar 7.5 7.5 7.5 7.5 7.5 7.5

Electrical Fuse rating amp 5 5 5 5 5 5Power consumption - standby W 3.5 3.5 3.5 3.5 5.5 5.5Power consumption - max W 100 100 145 145 210 290Electrical requirements V 220 - 240 @ 50Hz 220 - 240 @ 50Hz

Misc Weight full kg 370 485 380 490 485 505Weight empty kg 155 165 170 180 185 205Maximum outlet temperature ºC 65 65 65 65 65 65Maximum flue gas temperature ºC 90 90 90 90 90 90

Connection sizes and Dimensions

Inlet/outlet connections BSP 11/2” 11/2” 11/2” 11/2” 11/2” 11/2”Return connection BSP 1” 1” 1” 1” 1” 1”Gas connection BSP 3/4” 3/4” 3/4” 3/4” 3/4” 3/4”Water heater height mm 1556 1980 1556 1980 1980 1980Diameter of water heater mm 602 602 602 602 602 602Water heater depth mm 1046 1046 1046 1046 1046 1046Flue diameter - conventional flue mm 80 80 80 80 130 130Flue diameter - concentric balanced flue mm 80/125 80/125 80/125 80/125 130/200 130/200

Service clearance

Front mm 800 800 800 800 800 800Right side mm 200 200 200 200 200 200Rear mm 200 200 200 200 200 200Left side mm 300 300 300 300 300 300Above mm 300 300 300 300 300 300

Shipping Shipping width mm 880 880 880 880 880 880Shipping depth mm 1160 1160 1160 1160 1160 1160Shipping height mm 2213 2213 2213 2213 2213 2213Shipping weight kg 224 239 234 239 254 274

MAXXflo EVO comes with one factory fitted T&P valve in the single burner models and two T&P valves in the twin.

Technical information

7

MAXXflo EVO suggested engineer specification

The MAXXflo EVO is a high efficiency fully condensing floor standing storage water heater incorporating multiple heat exchanger modules*.

Each independent tube heat exchanger module shall be located on the side of the storage vessel, be constructed from grade 316L stainless steel. The integral storage tank shall be constructed from grade 316L stainless steel and both shall be connected with 22mm and 28mm interconnecting copper pipework.

The storage vessel shall be insulated with carbon impregnated polystyrene having a standby heat loss value from 1.68kWh/day, incorporate an inspection hatch located on the top of the vessel and have a painted steel outer casing.

The water heater shall be ErP compliant and incorporate a 10-bar / 95ºC Temperature and Pressure relief valve; a condensate trap and be manufactured under the ISO 9001 quality system.

HYDRAULIC, GAS AND FLUE CONNECTIONS

The water heater shall be designed for boosted, direct mains and open vented water systems. It shall be suitable for operating on systems up to a maximum pressure of 6 bar (unvented systems).

The hot water outlet, cold water supply, secondary return and gas connections shall be 3/4” BSP and shall be located on the top of the water heater. An inspection manifold shall also be provided and located on the top of the water heater.

The water heaters shall be suitable for Natural Gas or LPG.

The water heater shall be suitable for either Conventional flued installation and have either an 80mm or 130mm flue outlet diameter (model dependant) or Concentric balanced flued installation and have either an 80 / 125mm or 130 / 200mm flue outlet diameter (model dependant).

OPERATION

Each MAXXflo EVO incorporates pre mix fully modulating gas burner module/s* with electronic ignition and ionisation control. Each burner shall provide modulation from 100% to 10%, efficiencies of 98% (Gross CV) and NOx emissions of 39 mg/kWh or lower.

Each heat exchanger module also has its own high efficiency fully modulating A rated pump and an integral flue non return valve.

As standard the MAXXflo EVO Siemens controls provides a detailed graphical interface giving access to live data, settings and history. Also, full control of the burner(s) with accurate charging of the integral tank and control/ monitoring of auxiliary pump(s) and tank(s). The in-built anti legionella facility includes control of secondary return circuit temperature and pump operation (pump not included). Times can be set via the integral time clock.

The control panel display indicates operating water temperature and lockout status. ELECTRICAL CONTROLS The unit shall be supplied as standard with the following controls:

- Full PID modulation controls

- Modbus BMS connectivity

- Status outputs for run and fault indication via V.F.C

- Enable – V.F enable input

- Volt free contact

- Anti-Legionella function complete with secondary return temperature

- Full control of secondary return pump

Each MAXXflo EVO shall be CE and GAR approved for UK and IE. WRAS is pending.

*90 and 120kW models


718

1046

9F 13

6E 02

R

EM

OV

EA

BLE

AIR

DU

CT

SP

IGO

T FO

R L

OW

ER

DO

OR

CLE

AR

AN

CE

671

209

60

172

602 91

91

301

C GAS INLET

CG ONCENTRIC FLUE/AIR DA HW 1.5" BSP (m)

MA CWS1.5" BSP (m)

210

496

395

300

391

128

CONDENSATE TRAP41mm

1 x PLUGGED OUTLETS1" BSP (f)

SB ECONDARY RETURN

1" BSP (m)

INSPECTION HATCH & SENSOR WELL

T&P VALVE EXIT

TANK DRAIN (INSIDE UNIT)22mm ISOLATION VALVE

97

LH Side Front DoorInner Cover

MULTIPLE CABLEENTRY POINT

REMOVABLE AIR DUCTSPIGOT PLATE

259

REMOVABLE PLATEFOR TANK CONNECTIONINSPECTION (INSIDE UNIT)

USER DISPLAYPOWER & RESETSWITCHES

MANUALBLEED VENT

1 x T&P VALVE28mm

D 2

01 m

odel

s =

1556

mm

, 301

&30

2 m

odel

s =

1980

mm

1584

for 2

00 li

tre m

odel

s20

08 fo

r 300

litre

mod

els

718

1046

9F 13

6E 02

R

EM

OV

EA

BLE

AIR

DU

CT

SP

IGO

T FO

R L

OW

ER

DO

OR

CLE

AR

AN

CE

671

209

60

172

602 91

91

301

C GAS INLET

CG ONCENTRIC FLUE/AIR DA HW 1.5" BSP (m)

MA CWS1.5" BSP (m)

210

496

395

300

391

128

CONDENSATE TRAP41mm

1 x PLUGGED OUTLETS1" BSP (f)

SB ECONDARY RETURN

1" BSP (m)

INSPECTION HATCH & SENSOR WELL

T&P VALVE EXIT

TANK DRAIN (INSIDE UNIT)22mm ISOLATION VALVE

97

LH Side Front DoorInner Cover

MULTIPLE CABLEENTRY POINT

REMOVABLE AIR DUCTSPIGOT PLATE

259

REMOVABLE PLATEFOR TANK CONNECTIONINSPECTION (INSIDE UNIT)

USER DISPLAYPOWER & RESETSWITCHES

MANUALBLEED VENT

1 x T&P VALVE28mm

D 2

01 m

odel

s =

1556

mm

, 301

&30

2 m

odel

s =

1980

mm

1584

for 2

00 li

tre m

odel

s20

08 fo

r 300

litre

mod

els

Dimensions and connections

Side view Front view

SINGLE BURNER TWIN BURNER

CWH 30/201 CWH 60/201 CWH 30/301 CWH 60/301 CWH 90/302 CWH 120/302

A: Inlet/outlet connections BSP 11/2 11/2 11/2 11/2 11/2 11/2

B: Return connection BSP 1 1 1 1 1 1

C: Gas connection BSP 3/4 3/4 3/4 3/4 3/4 3/4

D: Water heater height mm 1556 1556 1980 1980 1980 1980

E: Width of water heater mm 602 602 602 602 602 602

F: Water heater depth BSP 1046 1046 1046 1046 1046 1046

G: Flue diameter - connection balanced flue mm 80/125 80/125 80/125 80/125 130/200 130/200

9

(not supplied)

(optional p/n 7720070)

(supplied with BUFFER-SS-300 p/n 7735728)

WIRING DIAGRAM FOR MAXXflo EVO with ADDITIONAL STORAGE TANKS

Modbus

Q4 DHW Circulation Pump 1A Max(not supplied)

B39 DHWReturn Sensor Kit(supplied as standard)

Ground

Common, max 230V

Enable

L

E

N

STANDARD BMS CONNECTIONS STANDARD WIRING FOR SECONDARY RETURN PUMP

(not supplied)

(optional p/n 7720070)

(supplied with BUFFER-SS-300 p/n 7735728)

WIRING DIAGRAM FOR MAXXflo EVO c/w ADDITIONAL STORAGE TANKS

Q4 DHW Pump(not supplied)

B39 DHW Return Sensor Kit

K21 Transfer Pump(not supplied)

AGU2.5 Extension Module(optional p/n 7720070)

BUFFER-SS-300(p/n 7735728)ST1 10k Tank Sensor

Br

BrBe N

L

Be L N

E

E

Wiring information


Typical flue installation

Model

30/201 30/301 60/201 60/301 90/302 120/302

Flues

Horizontal flue kit 7726957 7620230*Vertical flue kit 5103917 76202291m cuttable flue extension 5136148 772699490º elbow 5136151 762023245º elbow 5136150 7726992Flat roof plate E065 E217 Angled roof plate E066 E218Wall bracket 5136152 E219Wall guard E105 E630 Flue condense trap 7726982 7620233Condense bottle trap E211 E211Condense trap pipe kit E261 E261*there are no elbows included in kit 7620230

A2

010

The route of the flue is critical when planning horizontal runs, potential condensate traps must be avoided. When calculating maximum flue runs, a reduction must be made of one metre run per 90º elbow and a half metre run per 45º elbow.

The siting of the flue terminal is critical with respect to the performance of the unit. Areas where the discharge of combustion products would cause a nuisance should be avoided.

Concentric maximum equivalent flue length 30 & 60kW = 18 meters (C13, C33) 90 & 120kW = 24 meters (C13, C33)

Flue

11

Complete unvented systems kit and accessories

Ref Description Sales code

Complete unvented kit 7726954

B1 One piece inlet control (pressure reducing valve 6bar, check valve, pressure relief valve 8bar)

7727950

B2 Expansion vessel (24 litre) c/w bracket 7727951

B3 Temperature/pressure relief valve 10bar/95ºC (factory fitted) 7727952

B4 Tundish (supplied with the water heater) 7705047

B5 Flow through valve 7727953

To drain

B1

B5

B2

B3

HWS

B4

Cold water feed

Accessories Sales code

6 bar unvented system kit c/w flow through valve 7726954Set of 4 castors 7709385Clip in expansion module 7720070BUFFER-SS300-10, 300 litre stainless steel tank 7735728


Technical support and declaration of compliance

From brochures to CAD drawings and BIM files, you can access all the information you need at andrewswaterheaters.co.uk.

Or call our sales or technical departments on 0345 070 1057.

We can provide you with:

• Brochures • Technical sheets • Case studies • Installation manuals • CAD and BIM files • Size-It www.sizeit.co.uk • Energy-related Products directive data • Commissioning • Technical Information • Free training courses and CPDs available www.andrewswaterheaters.co.uk/training • 24/7 Out of Hours Engineer Support

The water heater must be installed in accordance with the following regulations:

BS 6700: Specification for design, installation, testing and maintenance of services supplying water for domestic use within buildings and their curtilages. This standard supersedes the following British Standards and Codes of Practice: CP99, CP310, CP324, 202, CP342 Part 2, Centralised Hot Water Supply.

BS 5440: Installation of flues and ventilation for gas appliances of rated output not exceeding 60kW.

Part 1: Specification for installation of flues.

Part 2: Specification for installation of ventilation for gas appliances.

BS 5546: Installation of gas hot water supplies for domestic purposes.

BS 6891: Installation of low pressure gas pipework of up to 28mm in domestic premises.

BS 7206: Specification for unvented hot water storage units and packages.

BS EN 806: (Parts 1 - 5) Specifications for installations inside buildings conveying water for human consumption.

BS 6644 Installation of gas fired water boilers of rated inputs between 70kW and 1.8MW. BS EN 12897 Water supply. Specification for indirectly heated unvented (closed) storage water heaters.

IGE/UP/1A,1B Strength/tightness testing and direct purging.

IGE/UP/2 Installation pipework.

IGE/UP/10 - 1 (Edition 4): Installation of gas appliances in industrial and commercial premises.

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SUPAflo EVOProduces a continuous supply of hot water and is designed for high demand environments that need high volumes of instant hot water.

ECOfloFully-condensing direct- fired efficient water heater suitable for large commercial properties where there’s a high demand for hot water.

MAXXflo EVODelivers superior flow outputs and low NOX for a class-leading performance, and is futureproofed with advanced BMS connectivity.

HIflo EVOHigh efficiency floor-standing storage water heater designed for bigger applications that require larger quantities of hot water.

CLASSICfloStandalone gas-fired water heater that can be installed on vented or unvented systems. It’s quick and easy to install, particularly as a replacement for existing water heaters.

CLASSICflo FAN FLUEDHas the addition of a fan assisted flue, making them the perfect choice for installations where longer flue runs are required.

Condensing

Non-condensing

Andrews Water Heaters range overview

15

FASTfloHigh efficiency, direct gas-fired, wall-hung continuous flow water heater, offering a very flexible, reliable and robust solution for where a continuous flow of hot water is required.

CLASSICflo BALANCEDOffers all the advantages of the CLASSICflo but with the additional benefit of a balanced flue. The concentric flue system draws air from outside the building, making it suitable for properties where the air might be contaminated.

HEXflo Plate Heat ExchangerProvides an instantaneous supply of domestic hot water to taps and showers in commercial and public sector buildings.

ECOflo COMPACTHigh efficiency condensing floor-standing storage water heater designed to meet your toughest installation challenges and hot water demands.

COMBIfloA range of condensing stainless-steel water heaters. With space heating capability, it produces both hot water and heating from a single heat generator and storage vessel enclosed in one cabinet.

FASTflo PLUSWall-hung condensing instant water heater. It’s very easy to install with only three simple connections to fit.

Andrews. Built to perform.

BAXI HEATING COMMERCIAL BRANDSALL TOGETHER BETTER

Registered office address: Baxi Heating UK, Brooks House, Coventry Road, Warwick CV34 4LL July 2019

Sales 0345 070 1055

Technical 0345 070 1057

Web andrewswaterheaters.co.uk

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Documents

MAXXflo EVO Technical Specification Guide